补偿电流的控制方法是实现有源电力滤波器功能的核心环节，本文采用单周控制的双向互补控制策略的单相有源电力滤波器能对电铁系统中的谐波电流起到很好的补偿作用，并建立了以双向互补控制策略为补偿电流控制方法的仿真模型，仿真结果表明单周控制技术可以用于电铁供电系统的有源电力滤波器的电流控制中，并且还能有效地滤除电力机车中的绝大部分谐波，使电源电流的畸变率大大降低。 Abstract: Compensating current control is the key tache to accomplish the various functions of active power filter. In the text， a single phase active power filter is proposed based on suppressing the electrified railway system harmonic current.One-cycle control of double-direction compensating control scheme have a great impact on the performance of it． And simulative model is established based on one-cycle control of double-direction compensating control schem. The simulative result shows that the current control schem above can be used in the electrified railway system to control harmonic current and filter a majority of the electric locomotive harmonic current and lower THD of the source current．